
/***************************************************************************
 * filespace.h -- a simple mechanism for storing dynamic amounts of data   *
 * in a simple to use, and quick to append-to structure.                   *
 *                                                                         *
 ***********************IMPORTANT NSOCK LICENSE TERMS***********************
 *                                                                         *
 * The nsock parallel socket event library is (C) 1999-2008 Insecure.Com   *
 * LLC This library is free software; you may redistribute and/or          *
 * modify it under the terms of the GNU General Public License as          *
 * published by the Free Software Foundation; Version 2.  This guarantees  *
 * your right to use, modify, and redistribute this software under certain *
 * conditions.  If this license is unacceptable to you, Insecure.Com LLC   *
 * may be willing to sell alternative licenses (contact                    *
 * sales@insecure.com ).                                                   *
 *                                                                         *
 * As a special exception to the GPL terms, Insecure.Com LLC grants        *
 * permission to link the code of this program with any version of the     *
 * OpenSSL library which is distributed under a license identical to that  *
 * listed in the included Copying.OpenSSL file, and distribute linked      *
 * combinations including the two. You must obey the GNU GPL in all        *
 * respects for all of the code used other than OpenSSL.  If you modify    *
 * this file, you may extend this exception to your version of the file,   *
 * but you are not obligated to do so.                                     *
 *                                                                         * 
 * If you received these files with a written license agreement stating    *
 * terms other than the (GPL) terms above, then that alternative license   *
 * agreement takes precedence over this comment.                          *
 *                                                                         *
 * Source is provided to this software because we believe users have a     *
 * right to know exactly what a program is going to do before they run it. *
 * This also allows you to audit the software for security holes (none     *
 * have been found so far).                                                *
 *                                                                         *
 * Source code also allows you to port Nmap to new platforms, fix bugs,    *
 * and add new features.  You are highly encouraged to send your changes   *
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 *                                                                         *
 * This program is distributed in the hope that it will be useful, but     *
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU       *
 * General Public License for more details (                               *
 * http://www.gnu.org/copyleft/gpl.html ).                                 *
 *                                                                         *
 ***************************************************************************/

/* $Id: filespace.h 6635 2007-12-22 06:32:18Z fyodor $ */

#ifndef FILESPACE_H
#define FILESPACE_H

#ifdef HAVE_CONFIG_H
#include "nsock_config.h"
#include "nbase_config.h"
#endif

#ifdef WIN32
#include "nbase_winconfig.h"
#endif

#include <stdlib.h>
#include <stdarg.h>
#if HAVE_STRING_H
#include <string.h>
#endif
#if HAVE_STRINGS_H
#include <strings.h>
#endif
#include "nsock_utils.h"

#define FILESPACE_LENGTH(fs) ((fs)->current_size)
#define FILESPACE_STR(fs) ((fs)->str)

struct filespace {
  int current_size;
  int current_alloc;
  char *pos; /* Current position in the filespace */
  char *str;
};

/* If you want to express a length, use fscat() */
static inline int fs_rputs(const char *str, struct filespace *fs) {
  char *new_str;
  int len = (int) strlen(str);

  if (len + fs->current_size + 1 > fs->current_alloc) {
    fs->current_alloc =  MAX(fs->current_size * 2, fs->current_size + len  + 1000);
    new_str = (char *) malloc(fs->current_alloc);
    memcpy(new_str, fs->str, fs->current_size);
    fs->pos = (fs->pos - fs->str) + new_str;
    if (fs->str)  
      free(fs->str);
    fs->str = new_str;
  }
  memcpy(fs->str + fs->current_size, str, len);
  fs->current_size += len;
  fs->str[fs->current_size] = '\0';
  return 0;
}


static inline int fs_rvputs(struct filespace *fs,...)
{
    va_list args;
    const char *x;

    va_start(args, fs);
    for (;;) {
        x = va_arg(args, const char *);
        if (x == NULL)
            break;
        if (fs_rputs(x,fs) == -1) {
          va_end(args);
          return -1;
        }
    }
    va_end(args);

    return 1;
}

/* Concatenate a string to the end of a filespace */
static inline int fscat(struct filespace *fs, const char *str, int len)  {
char *tmpstr;

if (len < 0) return -1;
if (len == 0) return 0;

/* printf("fscat: current_alloc=%d; current_size=%d; len=%d\n", fs->current_alloc, fs->current_size, len); */

  if (fs->current_alloc - fs->current_size < len + 2) {
    fs->current_alloc = (int) (fs->current_alloc * 1.4 + 1 );
    fs->current_alloc += 100 + len;
    tmpstr = (char *) malloc(fs->current_alloc);
    if (!tmpstr)
      return -1;
    memcpy(tmpstr, fs->str, fs->current_size);
    fs->pos = (fs->pos - fs->str) + tmpstr;
    if (fs->str) free(fs->str);
    fs->str = tmpstr; 
  }
  memcpy(fs->str + fs->current_size, str, len);

  fs->current_size += len;
  fs->str[fs->current_size] = '\0';
  return 0;
}

static inline int fs_rputc(int ch, struct filespace *fs) {
char s[2];

if (fs->current_size + 2 <= fs->current_alloc) {
  fs->str[fs->current_size] = ch;
  fs->current_size++;
  fs->str[fs->current_size] = '\0';
} /* otherwise we use the ueber-technique of letting fscat handle it ...
     umm actually I don't know why we don't do this in all cases ... */
 else {
   s[0] = ch;
   s[1] = '\0';
   fscat(fs, s, 1);
 }
return 0;
}

int fs_free(struct filespace *fs);
int filespace_init(struct filespace *fs, int initial_size);
int fs_clear(struct filespace *fs);
int fs_prepend(char *str, int len, struct filespace *fs);
#endif /* FILESPACE_H */

